Process for briqueting fines for ore, furnace-dust, waste metal, waste iron, &amp;c.



MAX GLASS, 0F VIENNA, AUSTRIA-HUNGARY.

PROCESS FOR BRIQUETING FINES OF 01m, FURNACE-DUST, WASTE IRON, 8w.

Specification of Letters Patent.

Patented May 1'7, 1910.

No Drawing. Original application filed December 11, 1909, Serial No. 532,603. Divided and this applicationfiled April 1, 1910. Serial No. 552,930.

T 0 all whom it may concern:

Be it known that 1, MAX GLASS, a subject of the Emperor of Austria-Hungary, residing at 176 Hadikgasse, Vienna, Austria- Hungary, have invented certain new and useful Improvements in Processes of Briqueting Fines of Ore, Furnace-Dust, aste Metal, lVaste Iron, and Like Materials; and I do hereby declare the following to be a full, clear, and exact description of the invention. V

The present application is a division of my application Serial No. 532,603, filed December 11, 1909.

The subject-matter of my invention is an improved process of briqueting fines of ore, furnace-dust, waste metal, waste iron and like materials, such as smelting-products, ores in pieces or in granular or powdered condition as well as waste material containing iron, and consists in adding to the material solutions as binding agent, whose basic salts enable the material to be briqueted owing to the product maintaining its consistency sufliciently long under the action of the blast and of the heat of the smeltingfurnace. Processes known heretofore for obtaining such briquets were too troublesome and expensive, as the material first had to be carbonized with organic binding agents or the briqueting operation itself had to take place in heat. Now according to my invention these basic salts which enable the material to be bound can be incorporated in the mass tobe briqueted by introducing into the same salts which when treated in the mass, possibly with the cooperation of the basic material lime, form insoluble compounds as binding means, the lime being also able to cooperate simultaneously in removing excess of moisture.

The subject-matter of my invention and the mode of carrying it into practice will now be described with reference to the following example: To this end, calcium acetate and aluminium sulfate can be employed withan admixture of solid, powdered quicklime, it being possible to add to the mass borax in addition when iron or like material is to be protected from rusting. After being mixed the material is subjected to pressure in a press and subsequently, if necessary to a temperature of about 100 C.

For carrying my process into practice the particles are held together with just the necessary strength.

According to its nature in each case the product is subsequently pressed. \Vhen eniploying calcium acetate and aluminium sulfate the insoluble precipitate does not form at once. \Vhen the solutions meet perfectly soluble aluminium acetate is first formed while cold and uniformly wets the briquet material. Owing to the subsequent heating to 100 C. Which is effectively aided by the presence of the quicklime when the same is slaked, gypsum and acetate of aluminium are separated, the colloidal nature of the precipitate and its glue-like consistence efiectively aiding the process. The acetic acid liberated during the conversion and the water are likewise taken up by the caustic lime in consequence of its relationship to lime and aids the heating. The following chemical process then first takes place:

whereupon the soluble acetate of aluminium is converted by the heat of absorption produc ed into an insoluble basic salt which has a binding action on the individual particles of metal. This takes place according to the following formula:

A1(CH,COO),+H2O:

AlOH 011,000 ,+oH,oooH.

The acetic acid liberated during the process is bound, during the further development of heat, by the quicklime present in excess, while the heat generated serves for continuing the process, 2'. e. forming basic aluminium acetate. The acetate of lime which is formed acts, on the aluminium sulfate present in excess and the above described binding process continues until all the liberated acetic acid is bound. There- METAL, WASTE fore the reactions taking place during the process may be comprised in the following equation:

' excess of acetic acid owing to assuming a slightly reddish coloration. The product obtained is then diluted with one liter of water. I

2. 60 grs. aluminium sulfate are dissolved in one liter water and 50 to 60 grs. powdered lime are added to this solution.

If the material to be briqueted, e. 9., iron or steel, is to be protected from oxidation owing to moisture, borax is added, To this end, 40 to 50 grs. borax are dissolved in one liter of water. If it is a matter of treating materials in which rusting cannot occur or in which rusting does not matter, e. 9., waste iron which is to be smelted down again, the admixture of borax is superfluous.

If the material to be bri ueted is soiled and highly rusted, the quantity of the binding a cut must be increased up to twice the state quantity.

for my process I claim! 1. The heremdescribed process of briquet- 1 ng ore, which consists in uniforml moistenmg the material to be briquete with an aqueous. solution of calcium acetate and aluminium sulfate, addin quicklime thereto, and heating the mass t us obtained to a temperature of approximately one hundred degrees centigrade, whereby the calcium acetate is converted into basic aluminium acetate which serves as a binder, substantially as described.

2. The hereindescribed process of briqueting ore, which consists in uniforml moistening the material to be briquete with an aqueous solution of calcium acetate and aluminium sulfate, adding quicklime and borax thereto, pressing the mass thus obtained, and heating the mass to a temperature of approximately 100 C.

3. A briquet having its particles held together by a cementitious compound insoluble in water comprising basic salt of aluminium together with borax to prevent oxidation, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

MAX GLASS.

Witnesses:

AUGUST FUGGER, ADA MARIA BERGER. 

